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diff --git a/src/common/Cryptography/Argon2.h b/src/common/Cryptography/Argon2.h
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+++ b/src/common/Cryptography/Argon2.h
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+/*
+ * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TRINITY_ARGON2_H
+#define TRINITY_ARGON2_H
+
+#include "BigNumber.h"
+#include "Define.h"
+#include "Optional.h"
+#include <string>
+
+namespace Trinity
+{
+namespace Crypto
+{
+struct TC_COMMON_API Argon2
+{
+    static constexpr uint32 HASH_LEN = 16;                    // 128 bits, in bytes
+    static constexpr uint32 ENCODED_HASH_LEN = 100;           // in chars
+    static constexpr uint32 DEFAULT_ITERATIONS = 10;          // determined by dice roll, guaranteed to be secure (not really)
+    static constexpr uint32 DEFAULT_MEMORY_COST = (1u << 17); // 2^17 kibibytes is 2^7 mebibytes is ~100MB
+    static constexpr uint32 PARALLELISM = 1;                  // we don't support threaded hashing
+
+    static Optional<std::string> Hash(std::string const& password, BigNumber const& salt, uint32 nIterations = DEFAULT_ITERATIONS, uint32 kibMemoryCost = DEFAULT_MEMORY_COST);
+    static bool Verify(std::string const& password, std::string const& hash);
+};
+}
+}
+
+#endif